Type 44 MC questions

[Joshua Van Tol]

>--- isham-research.freeserve.co.uk at pop.pol.net.uk,
>quk at isham-research.freeserve.co.uk wrote:
>
>>  One of the results of our experiments caused great
>>  debate - on an
>>  ur-quattro MB engine (very close relative of the
>>  MC-1) the plate is
>>  at full deflection by 4500 rpm at full boost.  So
>>  what supplies the
>>  extra fuel beyond this point to redline?
>>
>>  Answers please on a postcard to ...
>>
>Does the computer just extrapolate the curve set at
>say 3k-4.5k rpm?  If the other input parameters are
>unchanged (WOT switch position, plate position,
>manifold pressure) and the rpms continue to climb
>progressively...Doah-just realized, that works fine if
>injection is controlled by a computer.  BTW, if the
>plate is at full deflection at 4.5k rpm, does
>increased air velocity provide the additional air
>required for the climb to redline?
>
>Jim Accordino

I would think the ECU probably increases fueling based on absolute 
manifold pressure, using the frequency valve. There's lots of EFI 
systems where there's no metering of the air at all, just a MAP 
sensor, an accurate throttle position sensor, and an accurate and 
fast intake air temp sensor. They just map these inputs along with 
rpm into a flow rate.
-- 
Joshua Van Tol -- josh at spiny.com